(Harriet Tubman (c. 1820-1913), African American escaped slave and abolitionist. As quoted in Harriet, the Moses of Her People, by Sarah Bradford (1869).
Bradford was the friend and first biographer of the great abolitionist and ex-slave who, after escaping to freedom, returned nineteen times to the South and ushered more than 300 other runaway slaves, including her parents and brothers, to freedom in the North. While carrying out these extremely dangerous missions, Tubman carried a revolver. Should one of her charges tire and refuse to go on, she would point it at the runaway's head and say this, knowing that to leave anyone behind would jeopardize her rescue program and could cost many lives.)